XJS ( X27 ) 1975 - 1996 3.6 4.0 5.3 6.0

Who is the Transmission Guru ???

 
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Old 06-05-2019, 02:56 AM
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Default Who is the Transmission Guru ???

Hey guys i,m looking to tackle this nasty 30 year old transmission leak this weekend, However i cant remember if this is a Borg Warner 12 or a GM 400 Can any of you tell by the horrible oil stained picture i took.. Thanks in advance. 1976

I,m thinking it is a Borg Warner 12 ( if i remember correctly ) Thanks
 
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Old 06-05-2019, 03:17 AM
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Looks BW12 to me, but its many years since I looked.

Is the vac modulator on the RH side of the casing, just above the gasket line, near the front = TH400

Vac modulator on the LH rear, on the reaa face = BW12.

XJS had TH400 , the earlier XJ12 had the BW12, but the crankshaft was different also on the V12, to take the converter snout, sooooooo, being a Chev, and maybe a 5/8 crank hole, a BW12 was used, as that converter has the snout to suit that hole. The TH400 snout was more a "dome" as apposed to a "shaft" style of teh BW12.
 
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Old 06-05-2019, 03:31 AM
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I will put it up the ramps and look under it, but it is being run by a chevy V-8 so it makes me lean towards the BW Thank you. I will let you know as soon as i get under it.
 
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Old 06-05-2019, 06:40 AM
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The BW12 pan gasket is almost square. The TH400 is very irregular.

As far as I know the XJS used the BW12 until May 1977 or thereabouts





Cheers
DD
 
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Old 06-05-2019, 07:25 AM
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You guys are the BEST! !!!!!!!
 
 
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